The iPad's finally got some competition; in the past few weeks, the HP Slate made a brief appearance, the Samsung Galaxy Tab debuted, and just BlackBerry unveiled its business-minded PlayBook today. Here's how they all measure up:

Still, the battlefield's a lot more clearly defined than it was when we first compared tablets—both real and rumored—back in January. And as its rivals catch up, the iPad's looking increasingly outgunned.

That's just on the hardware side, though. Apple's still got three major advantages that opponents haven't made up much space on: iOS, the App Store, and a huge head start. It's going to take more than a pair of HD cameras to overcome that.